View of the Akershus Fortress, cannons and city skyline from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

akershus fortress oslo norway cannons city skyline historical site sunny day waterfront tourism travel sightseeing landscape greenery medieval fortress cultural heritage oslofjord pathways historic landmarks outdoor activities relaxing adventure exploration local culture visitor attractions public park scenic view military history cloudy skies norway skyline vibrant city heritage site stone walls nature gardens walking paths famous sites urban scenery majestic views fortifications architectural beauty historical significance ancient structures eco tourism cityscape open space peaceful historical tours guided tours outdoor enthusiasts recreational areas